... /60HzOUTPUTVoltage RangeAC 220V / AC 110VPrecision±1%/±3%(Servo Type) / ±10%(Relay Type)Efficiency98%PhaseSingle PhaseStatus DisplayInput Voltage, Output Voltage(Meter)ProtectionHigh ... ~40StorageTemperature-15~45Relative Humidity10%RH ~ 95%RH, Non-condensing AC Relay/Servo Type Voltage Regulator